PCB klama indlela yomzila yesignali ye-analog yesivinini esikhulu

Ububanzi bomugqa obanzi, buqinile ikhono lokulwa nokuphazamiseka kanye nekhwalithi yesignali engcono (ithonya lomphumela wesikhumba). Kepha ngasikhathi sinye, imfuneko ye-50Ω yesici kufanele iqinisekiswe. Ibhodi le-FR4 elivamile, ububanzi bomugqa ongaphezulu we-6MIL yi-50Ω. Lokhu ngokusobala akukwazi ukuhlangabezana nezidingo zekhwalithi yesiginali yokokufaka kwe-analog enesivinini esikhulu, ngakho-ke ngokuvamile sisebenzisa ukuvala i-GND02 futhi siyivumele ibhekisele kungqimba lwe-ART03. Ngale ndlela, isiginali yokuhlukanisa ingabalwa njenge-12/10, futhi umugqa owodwa ungabalwa njenge-18MIL. (Qaphela ukuthi ububanzi bomugqa budlula u-18MIL bese ukunwetshwa akusho lutho)

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

I-CLINE egqanyiswe ngokuluhlaza emfanekisweni ibhekisela ekufakweni komugqa owodwa kanye nomehluko we-analog enesivinini esiphezulu wesendlalelo se-ART03. Ngenkathi kwenziwa lokho, eminye imininingwane kufanele kusetshenzwe ngayo:

(1) Ingxenye yokulingisa ye-TOP layer idinga ukupakishwa, njengoba kuboniswe emfanekisweni ongenhla. Kufanele kuqashelwe ukuthi ibanga ukusuka ethusi eliphansi kuya kokokufaka kwe-analog CLINE lidinga ukuba ngu-3W, okungukuthi, i-AIRGAP ukusuka onqenqemeni lwethusi ukuya ku-CLINE iphinda kabili ububanzi bomugqa. Ngokuya kwezinye izibalo zethiyori kagesi kanye nokulingiswa, indawo kazibuthe kanye nenkambu kagesi yemigqa yesignali ku-PCB isatshalaliswa kakhulu phakathi kwebanga elingu-3W. (Ukuphazamiseka komsindo ovela kumasignali azungezile kungaphansi noma kulingana no-1%).

(2) Ikhopha ye-GND yongqimba oluphozithivu lwendawo ye-analogi nayo idinga ukuhlukaniswa endaweni yedijithali ezungezile, okungukuthi, zonke izendlalelo zihlukaniswe zodwa.

(3) Ukuze kukhishwe i-GND02, ngokuvamile sivala yonke le ndawo, ngakho-ke ukusebenza kulula futhi akunankinga. Kodwa uma sicabangela imininingwane noma ukuze senze kangcono, singakwazi ukuvala ingxenye ye-analog ye-wiring ye-analog, efana ne-TOP layer, indawo engu-3W. Lokhu kungaqinisekisa ikhwalithi yesiginali kanye nokucaba kwebhodi. Umphumela wokucubungula umi kanje:

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Ngale ndlela, indlela yokubuya yesiginali yokufaka i-analog enesivinini esiphezulu ingaphinde igeleze ngokushesha kungqimba lwe-GND02. Okusho ukuthi, indlela yokubuya eyenziwe yaphansi iba mfishane.

(4) Phuma ngokungafanele inombolo enkulu ye-GND ngokuzungeza isignali ye-analogi enesivinini esikhulu ukuze wenze isignali ye-analogi ibuyele emuva ngokushesha. Ingakwazi nokumunca umsindo.

I-PCB idizayina imithetho yomzila yesignali ye-analog enesivinini esiphezulu

Umthetho 1: Imithetho yokuvikela isignali ye-PCB enesivinini esiphezulu Kudizayini ye-PCB enesivinini esikhulu, ukuthuthwa kwemigqa yesignali engukhiye yesivinini esiphezulu njengamawashi kudingeka zivikelwe. Uma singekho isihlangu noma ingxenye yaso kuphela, izobangela ukuvuza kwe-EMI. Kutuswa ukuthi ucingo oluvikelwe lugaywe ngembobo ku-1000 mil.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho 2: Imithetho yomzila wesignali yesivinini esikhulu

Ngenxa yokuminyana okwandayo kwamabhodi e-PCB, onjiniyela abaningi be-PCB LLAYOUT bathambekele ekwenzeni iphutha ngesikhathi somzila, okungukuthi, amanethiwekhi esignali anesivinini esikhulu njengamasiginali wewashi, akhiqiza imiphumela evaliwe lapho behambisa ama-PCB anezingqimba eziningi. Njengomphumela weluphu evaliwe enjalo, kuzokhiqizwa iluphu iluphu, okuzokhuphula ukushuba kwemisebe ye-EMI.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho 3: Imithetho ye-loop evulekile yesiginali yesivinini esiphezulu

Umthetho 2 usho ukuthi iluphu evaliwe yamasignali anesivinini esikhulu izodala imisebe ye-EMI, kodwa iluphu evulekile izophinde ibangele imisebe ye-EMI.

Amanethiwekhi esignali anesivinini esikhulu njengamasiginali wewashi, uma umphumela we-loop evulekile uvela lapho i-PCB ye-multilayer ihanjiswa, kuzokhiqizwa uthi oluwumugqa, okwandisa amandla emisebe ye-EMI.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho 4: Umthetho wokuqhubeka kokuphazamiseka kwesiginali yesivinini esikhulu

Kumasignali anesivinini esikhulu, i-impedance yesici kufanele ibe ukuqhubeka lapho ushintsha phakathi kwezendlalelo, ngaphandle kwalokho izokwandisa imisebe ye-EMI. Ngamanye amazwi, ububanzi bezintambo zesendlalelo esifanayo kufanele buqhubeke, futhi ukuvinjelwa kwe-wiring yezendlalelo ezihlukene kufanele kuqhubeke.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho 5: Imithetho yokuqondisa izintambo yomklamo we-PCB enesivinini esikhulu

Izintambo eziphakathi kwezingqimba ezimbili eziseduze kufanele zilandele isimiso sezintambo eziqondile, ngaphandle kwalokho zizobangela ukungqubuzana phakathi kwemigqa futhi kwandise imisebe ye-EMI.

Ngamafuphi, izingqimba zezintambo eziseduze zilandela izinkomba zezintambo ezivundlile neziqondile, futhi izintambo eziqondile zingacindezela i-crosstalk phakathi kwemigqa.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho wesi-6: Imithetho yesakhiwo se-topological ekwakhiweni kwe-PCB enesivinini esikhulu

Ekwakhiweni kwe-PCB enesivinini esikhulu, ukulawulwa kwesici se-impedance yebhodi lesifunda kanye nokwakheka kwesakhiwo se-topological ngaphansi kwezimo zomthwalo omningi kunquma ngqo impumelelo noma ukwehluleka komkhiqizo.

Isibalo sibonisa i-daisy chain topology, ngokuvamile enenzuzo uma isetshenziswa ku-Mhz embalwa. Kunconywa ukusebenzisa isakhiwo esime okwenkanyezi esilinganisweni esingemuva edizayini ye-PCB enesivinini esikhulu.

Idizayina i-PCB indlela yokuhambisa isignali ye-analog enesivinini esiphezulu nemithetho

Umthetho 7: Umthetho we-resonance wobude bokulandelela

Hlola ukuthi ubude bomugqa wesignali kanye nemvamisa yesiginali kuhlanganisa ukukhala, okungukuthi, lapho ubude bezintambo buyinani eliphindwe kabili le-wavelength yesignali engu-1/4, izintambo zizokhala, futhi ukukhala kuzokhipha amaza kagesi. futhi kubangele ukuphazamiseka.